Liujiabao is only 5 miles away from Jingbian Fort, which is not very far, and it is a gallop all the way on a horse, that is, it takes 5 minutes to run.

At this time, Liujiabao is already a huge construction site, more than 10,000 people here to strike iron, digging soil, and cement and cement, mixing and mixing, steel bar and steel bar, division of labor and cooperation, busy in full swing, jointly building Liujiabao.

Liu Renyu took Hong Chengchou and Sun Kuisheng to Zhao Datie, the general person in charge of the Liujiapu project, and Zhao Datie, asked about the situation first.

"Daddy Zhao, you are not busy striking iron, I have something to ask you." Liu Renyu said to Daddy Zhao, who was naked and was wielding a hammer to hit the iron happily.

"Yo, Lord Liu, you are here, didn't you get married yesterday? Why did I come here today to inspect it? Alas! Since you're here, I'll rest for a while. Father Zhao first chattered for a while, then put down the hammer in his hand, wiped his sweat with a black towel, and then walked to Liu Renyu, and saw what Liu Renyu had to say.

"Father Zhao, this is Hong Chengchou, the governor of Yansui, Hong Junmen, who used to be the garrison of Jingbian Fort, and now he is the deputy general of Yan'an, and he is also my father-in-law, Sun Kuisheng Sun." Liu Renyu pointed to Hong Chengchou and Sun Kuisheng, who had just turned over and dismounted, and introduced them to Zhao Datie.

"Yo, it turned out to be two nobles, and the villain Zhao Datie has seen two officials." Zhao Datie heard that the biggest official in Yansui was in front of him, so he shivered for no reason, and then he quickly knelt on his knees respectfully, and made a big salute.

"The old man doesn't have to be polite, please get up, please get up." Hong Chengchou smiled slightly.

"Daddy Zhao, let you get up, you get up." Liu Renyu first helped Father Zhao up with both hands, and then continued: "Today, Hong Junmen and General Sun came to see the reinforced concrete city wall of our Liujiabao, and I ask you, can the foundation of the city wall be dug up?" ”

"My lord, I've been digging for more than half a month, but fortunately, there are a lot of us, and the people are also working hard, and we finished digging a few days ago."

"How much steel is there in the foundation?" Liu Renyu asked again.

"My lord, the output of steel bars here is not high, and the blacksmiths are hurrying up, even I, an old man, have gone into battle, and I haven't made much steel bars, so we just planted some steel bars in the foundation of the west side."

"Take us to see it." Liu Renyu ordered.

"Okay, a few officials, please come with the villain."

After Father Zhao finished speaking, he led Liu Renyu and the others to walk towards the foundation of the western section of the city wall, where the steel bars had been laid.

When the people came to the foundation, they saw that the people were tying together thumb-thick steel bars with iron wires to make a rectangular shape, and lay them flat at the bottom of the foundation.

Liu Renyu first looked at the steel bars that were bundled together in the foundation, and then introduced to Hong Chengchou and Sun Kuisheng: "Junmen, Yuezhang, at this time we are rolling the steel bars on the foundation, and when the steel bars on the foundation are finished, the construction people will tie down the steel bars 3 zhang long in the vertical direction, and then pour cement in the foundation first, wait until the cement in the foundation is dry, and then gradually pour cement upwards, and finally as long as the cement is dry, our city wall of Liujiabao will be completed." ”

"It is very fast to build a city in this way, and it does not cost glutinous rice, eggs, only sand, cement, and it does not cost much money, and this method of building a city is very wonderful."

Hong Chengchou looked at the scene in front of him, combined with the process of cement drying and solidification he had seen with his own eyes, coupled with the blueprint introduced by Liu Renyu, and couldn't help but sigh.

"Hehe, Junmen, I'll tell you the truth, if the speed of steel production can keep up, it will not take much time to build the city." Liu Renyu listened to Hong Chengchou's emotion, and did not forget to follow the previous sentence.

"Compared with the method of building a city commonly used by my Ming Dynasty at the moment, how much time can be saved by this method of building a city?" Hong Chengchou asked.

"Military gate, if the steel is sufficient, the time spent to build this city should be about half less than the traditional method, and this city wall is made of reinforced concrete, the hardness is higher, such as the cannonball fired by the red-coated cannon, hit the city wall, because this wall is a whole connected by steel bars, the force of the cannonball will be evenly distributed to the entire wall, so that the cannonball will be bounced off the wall, so the reinforced concrete city wall can withstand the cannon fire for a long time. However, because the hardness of the ordinary city wall is not enough, if it is fired by the red-coated cannon, it will cause the wall to crack due to the excessive force at a single point, and then cause the entire wall to collapse. ”

"If the hardness of this city wall is really as you said, to the point where the red-coated cannon can't shoot through and collapse after a long bombardment, and the time spent on construction is less than that of traditional methods, then I can use such a wonderful method to build a city in the future, saving time, effort and money. Renyu, after a while, your city has been repaired, be sure to inform me, if the city wall you said is really as good as you said, I should report to the imperial court, and in the future, whenever you want to build a new city, you will use your method. As a liberal arts student, Hong Chengchou didn't understand the principle that Liu Renyu said, but he still understood the function of the city wall, so after listening to Liu Renyu's introduction, he promised with bright eyes.

"No problem, Junmen, as long as the wall of Liujiabao is repaired, I will inform you as soon as possible, please come and see how hard this wall is?"

"Okay, let's finish reading the reinforced concrete city wall of Liujiabao, I can't see your out-of-season vegetables for the time being, you can bring me the soap you said tomorrow, right?" Hong Chengchou asked Liu Renyu.

"Exactly." Liu Renyu nodded.

"In other words, we have nothing to do for the time being, Renyu, my stomach is empty, let's find a place to eat and drink first, how about it?" Hong Chengchou touched his stomach and said with a smile.

"Yo, military gate, damn it, just talk to you and your father-in-law, but I forgot that the meal has already passed, let's go back and eat roast whole sheep."

After Liu Renyu said this, he told Father Zhao to speed up the progress, and then he went all the way back to Jingbian Fort with Hong Chengchou and Sun Kuisheng.

After Liu Renyu and Hong Chengchou were obtained, Sun Kuisheng returned to the garrison mansion, and Liu Renyu ordered the cook to make roasted whole sheep, a famous dish of the Mongolian steppe.

During the meal, Liu Renyu seized the time to continue to introduce other wonderful uses of reinforced concrete in building bridges, and then he also proposed the concept of horse-drawn trains, which opened the eyes of Hong Chengchou and Sun Kuisheng, and they praised Liu Renyu's novelty ideas one after another.

In the afternoon, Sun Yuyun was almost raised, and she felt that it didn't seem good if she didn't go to see Hong Chengchou again, so she had to hold back her shyness and come to greet Liu Renyu's nominal Gao Tang Hong Chengchou accompanied by Wan'er.

This Hong Chengchou knew that the bride who had just gone through personnel was a little thin-skinned, so he didn't say anything about why she came to greet her so late, and only said something like waiting for her husband and helping Liu Renyu take care of housework.

And Sun Kuisheng also followed and told some daily chores to wait for her husband, and Sun Yuyun listened to it, and they all said yes again and again.

On the evening of the same day, Liu Renyu and Sun Yuyun had a wine and dinner with Hong Chengchou and Sun Kuisheng.

During the banquet, Liu Renyu invited his father-in-law to come to see the mystery of soap tomorrow, and Sun Kuisheng knew that his son-in-law must have another amazing invention, so he naturally agreed to come and see the excitement.

******

The next day, in the courtyard of the Jingbian Fort Garrison Mansion, Liu Renyu held a yellow-brown object in his hand, scooped up a piece of clothing from the wooden basin, pointed to the stains on the clothes, and said to Hong Chengchou, Sun Kuisheng, and his own mother Sun Yuyun who were watching: "Look, there are grease stains on the collar, as well as stains on the cuffs, as well as oil stains and blood stains that I specially added. Now, something magical is about to happen. ”

As far as Liu Renyu said, the stains are extremely stubborn on weekdays, and they can hardly be washed, but Liu Renyu took the thing called soap, washed it, scrubbed it, and touched it for about 20 minutes.

Then everyone looked at the soap-baptized clothes, and found that not only the collar and cuffs were washed, but the oil stains and blood stains were almost impossible to see if they were not carefully looked, and what surprised them even more was that after this dress was washed by Liu Renyu, it actually changed from gray to white, and it seemed to have returned to its original appearance.

Seeing this scene, everyone couldn't help but exclaim, soap is really a good thing.